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Use | instead of + when or-ing shifted partial words to encourage

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compiler to use roll instruction on x86

	modified:   src/byteswap.c
This commit is contained in:
Nick Briggs 2017-06-25 18:13:09 -07:00
parent cef5b57a9d
commit 1867f69be9
1 changed files with 4 additions and 4 deletions
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8
src/byteswap.c
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@ -31,7 +31,7 @@ static char *id = "$Id: byteswap.c,v 1.5 2002/01/02 08:15:16 sybalsky Exp $ Copy
#include "lsptypes.h"
#include "stack.h"
#ifdef ISC
#if defined(ISC)
#include "inlnPS2.h"
#else
@ -41,7 +41,7 @@ static char *id = "$Id: byteswap.c,v 1.5 2002/01/02 08:15:16 sybalsky Exp $ Copy
/* */
/****************************************************************/
unsigned int swapx(unsigned int word) {
return (((word >> 16) & 0xffff) + ((word & 0xffff) << 16));
return (((word >> 16) & 0xffff) | ((word & 0xffff) << 16));
}
/****************************************************************/
@ -50,7 +50,7 @@ unsigned int swapx(unsigned int word) {
/* */
/****************************************************************/
unsigned short byte_swap_word(unsigned short word) {
return (((word >> 8) & 0xff) + ((word & 0xff) << 8));
return (((word >> 8) & 0xff) | ((word & 0xff) << 8));
}
/****************************************************************/
@ -66,7 +66,7 @@ unsigned int word_swap_longword(word)
return( ((word>>16)&0xffff)+((word&0xffff)<<16) );
} ***/
#ifndef I386
#define word_swap_longword(word) (((word >> 16) & 0xffff) + ((word & 0xffff) << 16))
#define word_swap_longword(word) (((word >> 16) & 0xffff) | ((word & 0xffff) << 16))
#endif
#endif /* AIXPS2 */